Asteroid Fact Sheet, National Space Science Data Center at Goddard Space Flight Center
Check out a list of numerous asteroids with a data set for each.

What Are Asteroids? National Space Science Data Center at Goddard Space Flight Center
Read a detailed description of asteroids, the different types of asteroids, and where asteroids are located in the solar system.

Comets

Comet Fact Sheet, National Space Science Data Center at Goddard Space Flight Center
Check out this list of numerous comets with a data set for each.

Division of Meteorites, National Museum of Natural History - Smithsonian
What is a meteorite? How do you recognize a meteorite if you have one? Find out the answers to these questions plus get information about additional resources.

To see more images of Asteroid Ida and her moon, visit the following web site:

Asteroids, National Space Science Data Center Photo Gallery
See images of several different asteroids, including Ida and its moon, Dactyl.

To see more images of Halley's Comet, visit the following web sites:

Giotto Mission Page, National Space Science Data Center Photo Gallery
See images of Halley's Comet taken by Giotto when the comet last past Earth in the 1980s.

Comets, National Space Science Data Center Photo Gallery
See some images of several different comets, including Halley.